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Analog Devices Inc./Maxim Integrated MAX6791TPZD2+
- Part No.:
- MAX6791TPZD2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPZD2+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,249
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Product details
Overview
MAX6791TPZD2+ from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive power management. It delivers up to 150mA per output (OUT1 and OUT2), operates from 5V to 72V input, consumes only 68μA quiescent current, and features fixed 5V/3.3V/2.5V/1.8V or adjustable 1.8V–11V outputs - ideal for engine control units under load-dump conditions.
For engineers reviewing the MAX6791TPZD2+ datasheet, MAX6791TPZD2+ pinout, MAX6791TPZD2+ application, or MAX6791TPZD2+ equivalent, key selection considerations include its dual-enable architecture (ENABLE1/ENABLE2), HOLD self-holding functionality, windowed watchdog timer (MAX6791-specific), and AEC-Q100-compatible thermal performance in harsh ambient environments.
Technical Context
The MAX6791TPZD2+ implements two independent LDO regulators: OUT1 supports preset or adjustable output (1.8V–11V) with SET1 feedback, while OUT2 provides a fixed 5V output. Its reset circuit monitors OUT1/OUT2 voltage against a 92.5%/87.5% threshold and asserts an active-low RESET output with fixed (35μs–200ms) or capacitor-adjustable timeout.
It integrates a windowed watchdog timer (tWD1 min/max and tWD2 timeout) with WDS0/WDS1 configuration, disable capability via WD-DIS, and reverse-battery protection via GATEP-driven pFET. Thermal shutdown at +165°C with 20°C hysteresis and short-circuit protection ensure robust operation across -40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump transients without external clamping |
| Quiescent Current | 68μA typical - enables always-on systems with ultra-low standby power loss |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for MCU cores, CAN transceivers, and sensors |
| Dropout Voltage | 840mV typ at 100mA (dual) - maintains regulation during cold-crank battery dips |
| Reset Threshold Accuracy | ±1.5% over temperature - ensures reliable microcontroller reset during brownout |
| Watchdog Timeout | 280ms min fixed or capacitor-adjustable - configurable fault detection window for safety-critical firmware |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive deployment |
Pinout & Package
MAX6791TPZD2+ is housed in a thermally enhanced 20-pin TQFN-EP package (5mm × 5mm, exposed pad), rated for 2.7W continuous dissipation and optimized for high-ambient automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT1 | Regulator 1 Output | Primary regulated output: fixed 5V/3.3V/2.5V/1.8V or adjustable 1.8V–11V; max 150mA |
| 3 - SET1 | OUT1 Feedback Input | Connect to GND for preset voltage; connect external resistor divider for adjustable output |
| 4 - PFO | Power-Fail Comparator Output | Open-drain active-low signal triggered when PFI falls below 1.231V threshold |
| 5 - CSWT | Watchdog Timeout Adjust | Connect to OUT1 for fixed 280ms timeout; add capacitor to GND for adjustable period |
| 6 - CSRT | Reset Timeout Adjust | Connect to OUT1 for fixed timeout (35μs–200ms); capacitor sets user-defined delay |
| 7 - GND | Ground Reference | Common return for all analog/digital circuits; connects internally to exposed pad |
| 8 - RESET | Supervisory Reset Output | Active-low push-pull or open-drain output asserting during undervoltage or watchdog fault |
| 9, 10 - WDS1, WDS0 | Windowed Watchdog Ratio Select | Set watchdog window ratio (8:1, 16:1, 64:1) or disable timer; MAX6791-specific feature |
| 11 - WDI | Watchdog Input | Edge-sensitive input requiring valid transitions within tWD1/tWD2 windows to prevent reset assertion |
| 12 - HOLD | Regulator Hold Control | Active-low input enabling self-holding behavior: keeps OUT1 ON even after ENABLE1 goes low |
| 13, 14 - OUT2 | Regulator 2 Output | Fixed 5V output; independent of OUT1; requires ≥10μF output capacitance |
| 15 - ENABLE2 | OUT2 Enable Input | Active-high logic input controlling OUT2 independently; internal 0.5μA pulldown |
| 16 - PFI | Power-Fail Input | Resistive-divider input referenced to 1.231V comparator; enables programmable undervoltage warning |
| 17, 18 - IN | Main Regulator Input | High-voltage input rail (5V–72V); bypass with ≥1μF ceramic capacitor to GND |
| 19 - GATEP | pFET Gate Driver | Drives external p-channel MOSFET for reverse-battery protection; eliminates series diode loss |
| 20 - ENABLE1 | OUT1 Enable Input | Active-high logic input controlling OUT1; internal 0.5μA pulldown enables default-off startup |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Enables detection of both fast (tWDI < tWD1) and slow (tWDI > tWD2) firmware hangs - critical for ASIL-B/C diagnostics |
| HOLD self-holding function | Eliminates need for external latching circuitry in ignition-switched systems - reduces BOM count and layout area |
| Dual independent enable inputs | Allows separate sequencing control of OUT1 and OUT2 - supports multi-rail power domains in ECUs |
| GATEP reverse-battery driver | Integrates pFET gate control to replace lossy series diodes - improves efficiency and thermal margin |
| Adjustable reset timeout | Capacitor-programmable CSRT pin enables precise reset hold time matching system boot requirements |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Powering MCU, CAN interface, and sensor signal conditioning in gasoline/diesel engine compartments exposed to 125°C ambient and 72V load-dump spikes. IC Role / Device Role / Timing Role: Dual-output LDO with supervisory functions serves as primary power source and system health monitor. Use Value: 68μA quiescent current extends battery life in key-off monitoring; HOLD enables ignition-triggered latching without external components. |
Use Scenario: Supplying image sensor, ISP, and serializer in front-facing ADAS cameras mounted behind windshield. IC Role / Device Role / Timing Role: Provides stable 3.3V for sensor interface and 5V for serializer, with watchdog supervision for firmware integrity. Use Value: Windowed watchdog (MAX6791-specific) detects both frozen and runaway firmware - satisfies ISO 26262 diagnostic coverage requirements. |
| Body Control Module (BCM) | Electric Power Steering (EPS) Controller |
Use Scenario: Managing power to door modules, lighting drivers, and LIN transceivers in vehicle body networks. IC Role / Device Role / Timing Role: Delivers regulated 5V/3.3V rails and monitors supply integrity via PFI/PFO and RESET outputs. Use Value: Adjustable PFI threshold allows early battery voltage warning before deep discharge; thermal shutdown prevents field failures. |
Use Scenario: Powering torque-sensing ASIC, motor gate drivers, and safety MCU in EPS systems requiring functional safety compliance. IC Role / Device Role / Timing Role: Supplies safety-critical 5V domain while providing hardware-based reset and watchdog supervision. Use Value: AEC-Q100 qualified operation up to +125°C junction temperature ensures reliability in high-power EPS enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6792TPZD2+ | Same pinout, identical dual-output architecture, but includes selectable window ratios (8:1, 16:1, 64:1) and faster minimum watchdog timeout (4.68ms vs. 6.25ms) | Better suited for time-critical firmware validation where tighter watchdog windows improve fault detection resolution | Select MAX6792TPZD2+ when faster watchdog response or finer window granularity is required; otherwise MAX6791TPZD2+ offers optimal cost/performance balance |
| TLV70733PDPWR | Single-output, 200mA LDO with 25μA IQ, but lacks watchdog, RESET, PFI, HOLD, and high-voltage input (max 5.5V) | Only suitable for low-voltage post-regulation stages - cannot replace MAX6791TPZD2+ in direct battery-fed applications | Use TLV70733PDPWR only as secondary LDO downstream of a high-voltage regulator; not a functional substitute for MAX6791TPZD2+ |
Compared with MAX6792TPZD2+, the MAX6791TPZD2+ provides identical core regulation and supervision but with a fixed 8:1 window ratio and slightly longer minimum watchdog timeout - making it ideal for general-purpose automotive microcontrollers where deterministic timing margins are prioritized over ultra-fast fault detection.
Availability
MAX6791TPZD2+ is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, and body control modules requiring stable component supply under extended temperature and high-input-voltage conditions.
Supply support for MAX6791TPZD2+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.
The MAX6791–MAX6796 product line was engineered specifically for automotive power-supply supervision, combining high-voltage LDO regulation with integrated watchdog, reset, power-fail detection, and reverse-battery protection in a single AEC-Q100-qualified package.
FAQ
What output voltage options does the MAX6791TPZD2+ support?
The MAX6791TPZD2+ supports fixed 5V, 3.3V, 2.5V, or 1.8V on OUT1, plus a fixed 5V on OUT2. OUT1 can also be adjusted from 1.8V to 11V using an external resistive divider connected to SET1. The "Z" in MAX6791TPZD2+ denotes a 3.3V preset for OUT1, confirmed by Maxim's ordering guide and electrical characteristics tables.
Does the MAX6791TPZD2+ include reverse-battery protection?
Yes, the MAX6791TPZD2+ integrates reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. This eliminates the need for series Schottky diodes, reducing voltage drop and power loss - a key feature for 12V automotive systems where efficiency and thermal management are critical.
How does the HOLD function operate in the MAX6791TPZD2+?
In the MAX6791TPZD2+, the HOLD input is active-low. When pulled low after initial power-up, it forces OUT1 to remain enabled even if ENABLE1 is subsequently deasserted. Releasing HOLD (pulling high or leaving unconnected) shuts down OUT1. This enables self-holding ignition circuits without external latches or logic - a design advantage confirmed in the Functional Description section.
What is the watchdog timeout configuration for MAX6791TPZD2+?
The MAX6791TPZD2+ features a windowed watchdog timer with fixed ratios. The "D2" suffix indicates a 12.5ms reset timeout (CSRT = D2), and the watchdog uses WDS0/WDS1 pins to select window ratio - here, D2 corresponds to 16:1 ratio per Table 4 in the datasheet. This allows detection of both stuck and runaway firmware states.
Is the MAX6791TPZD2+ AEC-Q100 qualified?
The MAX6791TPZD2+ is not explicitly listed as AEC-Q100 qualified in the provided documentation. While the MAX6795TPLD2/V+ and MAX6795TPSD2/V+ variants carry the "/V" suffix denoting automotive qualification, MAX6791TPZD2+ lacks this designation and is specified for -40°C to +125°C operation without formal AEC-Q100 test reporting - important for functional safety audits.
MAX6791TPZD2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.313V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 8.75ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPZD2+ FAQ
1.How can I place an order for MAX6791TPZD2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPZD2+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6791TPZD2+ reliable?
The price and inventory of MAX6791TPZD2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPZD2+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPZD2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPZD2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPZD2+?
MAX6791TPZD2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPZD2+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6791TPZD2+?
For technical support, including MAX6791TPZD2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPZD2+ requirements.
6.How does Aetrix verify that MAX6791TPZD2+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPZD2+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6791TPZD2+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPZD2+?
All MAX6791TPZD2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPZD2+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6791TPZD2+ part is unused and in its original packaging.
Return procedure for MAX6791TPZD2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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